Number of Solutions: The number of single-source scans that have been used to determine the pointing model parameters. Each measurement corresponds to a 5-pointing raster centered on a calibrator. The pointing program then calculates the observed source position from the 5 point raster, and compares it to the nominal source position as commanded by the encoders. Sometimes the pointing performance is so poor that no positional fit is obtained from the 5-point raster, and the measurement is therefor rejected. Typically between 70 and 90 measurements are used in a given pointing run. If an antenna shows a number of measurements lower than the mean by 20 or so, then this is an indication of a major pointing problem for that antenna.